Stop ipods from automounting

I'm trying to lock down a mac so that employees can't play around with it.

I can't seem to figure out how to stop iPods from automounting. I've done some googling and found that I can prevent certain named drives from automounting, but I can't seem to find a way to stop all drives.

Sometimes employees plug in their iPods to charge, and we really wouldn't mind that, if I could just stop them from mounting.